Alex who was shocked at first by Matthew's sudden movement was still able to react on time. When Matthew had pointed his rifle at Alex's face, Alex was able to do the same and was pointing his two guns at Matthew's face and heart.
Matthew seeing the reaction of his rival and so-called friend made him smile a very joyous smile. Alex pushed the rifle using his left hand, while his right handgun still pointed at his opponents face. Matthew then changed the position of his rifle and pointed it downward evading Alex's hand, and pushing it to the side. While his free left hand pushed Alex's handgun that was pointing at him.
Alex seeing the moving hand of Matthew and followed it, by pushing the rifle downwards. While backing up the right handgun and changing the direction of where his handgun was pointing at.